ANTACIDS

Antacids are medications that work by neutralizing acid that is already in the stomach. Antacids usually contain calcium, aluminum, or magnesium. Antacids containing magnesium tend to have a laxative action; those containing aluminum may cause constipation. Magnesium carbonate works
by liberating carbon dioxide from the stomach, and can cause frequent belching. Alginates, such as sodium alginate, are another common ingredient of indigestion or heartburn remedies. These work by forming a protective coating over the walls of the stomach and esophagus.

No matter which antacid remedy you choose, it is best to take them after a meal, especially if you drank alcohol with the meal or if you plan to go to sleep less than 3 hours after eating.